PMAP_MAP(9) BSD Kernel Developer's Manual PMAP_MAP(9)NAME
pmap_map -- map a physical memory range into kernel virtual address (KVA) space
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/pmap.h>
vm_offset_t
pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot);
DESCRIPTION
The pmap_map() function maps a range of physical addresses into kernel virtual address (KVA) space, from start to end, with protection bits
prot.
The value passed in *virt is treated as a hint for the virtual address of the beginning of the mapping.
IMPLEMENTATION NOTES
The prot argument is currently ignored by machine-dependent implementations.
Architectures which can support a direct mapped physical to virtual region can return the appropriate address within that region, leaving
*virt unchanged.
RETURN VALUES
The pmap_map() function returns the virtual address of the beginning of the mapping, if the mapping was successfully made; *virt will also be
updated with the first usable address after the mapped region.
If the function is unsuccessful, NULL is returned.
SEE ALSO pmap(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 21, 2003 BSD
Check Out this Related Man Page
VM_MAP_FINDSPACE(9) BSD Kernel Developer's Manual VM_MAP_FINDSPACE(9)NAME
vm_map_findspace -- find a free region within a map
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_findspace(vm_map_t map, vm_offset_t start, vm_size_t length, vm_offset_t *addr);
DESCRIPTION
The vm_map_findspace() function attempts to find a region with sufficient space in the map for an object of size length at the address addr.
IMPLEMENTATION NOTES
It is the caller's responsibility to obtain a lock on the map using vm_map_lock(9) before calling this function.
This routine may call pmap_growkernel(9) to grow the kernel's address space, if and only if the mapping is being made within the kernel
address space, and if insufficient space remains in the kernel_map.
RETURN VALUES
The vm_map_findspace() function returns the value 0 if successful, and *addr will contain the first virtual address in the found region; oth-
erwise, the value 1 is returned.
SEE ALSO pmap_growkernel(9), vm_map(9), vm_map_entry_resize_free(9), vm_map_lock(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 19, 2003 BSD
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